Contra Costa County property record for 3520 Keystone Loop, Discovery Bay, CA 94505 · Last verified July 2026
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 2.5 ba · 3,030 sqft · built 2003 |
| Lot Size | 0.165 acres (7,200 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $455,000 (Apr 2004) |
| Tax Bill | $9,197 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 011-421-032-1 |
| Primary APN | 011-421-032-1 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 2.5 Baths |
| Half Baths | 1 Half Bath |
| Total Rooms | 10 Rooms |
| Building Area | 3,030 sqft Living Area |
| 1st Floor Area | 1,952 sqft 1st Floor |
| 2nd Floor Area | 1,078 sqft 2nd Floor |
| Stories | 2 Stories |
| Year Built | Built 2003 |
|---|---|
| Effective Year Built | Effective 2004 |
| Architectural Style | Cluster |
| Lot Area | 7,200 sqft (0.165 acres) |
| Parking Spaces | 2 Parking Spaces |
| Garage Type | Attached |
| Garage Area | 615 sqft Garage |
| View / Lot | Lake |
| Cooling System | Central |
|---|
| Street Address | 3520 KEYSTONE LOOP |
|---|---|
| City | DISCOVERY BAY |
| State | CA |
| Zip | 94505-2321 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | T8430 L32 |
| Legal Subdivision | LAKESHORE 4 |
| Legal Tract | 8430 |
| Legal Lot Number | 32 |
| Jurisdiction | CONTRA COSTA CA |
| Township / Civil Division | EAST CONTRA COSTA |
| Census Block Group | 3 |
| Census Block | 3003 |
| Census Tract | 304007 |
Source: Contra Costa County records · APN 011-421-032-1
Assessment roll updated July 14, 2026 · Last verified July 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 3520 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2321 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Apr 28, 2004 · Amount on Record |
| Deed Sale | Apr 28, 2004 · Amount on Record |
| Deed Document Number | 2004153631 |
| Prior Transfer Date | Oct 16, 2002 |
| Prior Transfer Doc | 0000401496 |
| Record Updated | Sep 20, 2026 |
Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Contra Costa County |
| Elementary School District | Byron Union Elementary School District (KG - 08) |
| Secondary School District | Liberty Union High School District (09 - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $659,689 (+2%) Land $159,515 Building $500,174 | |
| 2025 | $9,197.00 (+6.71%) Homeowner's exemption | $646,755 (+4.04%) Land $156,388 Building $490,367 |
| 2023 | $8,619.00 (+1.68%) Homeowner's exemption | $621,642 Land $150,316 Building $471,326 |
| 2022 | $8,477.00 |
Source: FEMA National Flood Hazard Layer, Contra Costa County (06013C), updated October 12, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Flood Hazard | Moderate |
| 500-Year Floodplain | Yes |
| Special Flood Hazard Area | No |
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach |
Values are read at the parcel center point; lenders make the official flood determination.
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