Alameda County property record for 6121 Mount Olympus Dr, Castro Valley, CA 94552
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,531 sqft · built 1991 |
| Lot Size | 0.272 acres (11,850 sqft) |
| Owner | 2 Individual Names on File |
| Last Sale | $334,500 (Dec 2003) |
| Tax Bill | $12,010 (2025) |
| Deeds & Mortgages | Sep 2021 Mortgage Jan 2021 Mortgage + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 85A-6407-5 |
| Primary APN | 85A-6407-5 |
|---|---|
| Alternative APN |
|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 9 Rooms |
| Stories | 2 Stories |
| Building Area | 2,531 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1991 |
|---|---|
| Effective Year Built | Effective 1991 |
| Architectural Style | L-Shape |
| Exterior Material | Stucco |
| Construction Type | Wood |
| Roof Material | Tile |
| Lot Area | 11,850 sqft (0.272 acres) |
| Heating System | Forced Air with A/C |
|---|---|
| Heating Fuel | Gas |
| Sewer | Municipal |
| Water Source | Commercial |
| Street Address | 6121 MOUNT OLYMPUS DR |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94552-1960 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | LOT: 00010 BLK: TR: 5338 |
| Legal Tract | 5338 |
| Legal Lot Number | 10 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 2 |
| Census Block | 2012 |
| Census Tract | 430101 |
6121 Mount Olympus Dr is owned and occupied by two individuals who acquired it in March 2012.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | 2 Individual Names on File |
|---|---|
| Mailing Address | 6121 MOUNT OLYMPUS DR, CASTRO VALLEY, CA 94552-1960 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Sep 29, 2021 | Deed of Trust, Mortgage · Conventional Mortgage ROCKET MORTGAGE LLC |
| Jan 29, 2021 | Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LOANS LLC |
| Aug 15, 2017 | Deed of Trust, Mortgage · Line of Credit FREMONT BK |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 26, 2003 · Amount on File |
| Deed Sale | Dec 26, 2003 · Amount on File |
| Deed Document Number | 2003741107 |
| Last Transfer Date | Mar 9, 2012 |
| Transfer Doc | 0000092092 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Property Address | 6121 MOUNT OLYMPUS DR, CASTRO VALLEY, CA 94552-1960 |
| Transaction Type | Mortgage |
| Record Updated | Oct 20, 2021 |
| Title Company | CHICAGO TITLE COMPANY |
| Name | Verified Name |
|---|---|
| Address | 6121 MOUNT OLYMPUS DR, CASTRO VALLEY, CA 94552-1960 |
| Document Number | 0000325516 |
|---|---|
| Date | Sep 29, 2021 |
| Instrument | 2021325516 |
| Name | ROCKET MORTGAGE LLC |
|---|---|
| Type | Mortgage Company |
| Address | DETROIT, MI 48226 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 181 Months |
| Due | Oct 1, 2036 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Property Address | 6121 MOUNT OLYMPUS DR, CASTRO VALLEY, CA 94552-1960 |
| Transaction Type | Mortgage |
| Record Updated | Jul 9, 2021 |
| Title Company | CHICAGO TITLE |
| Name | Verified Name |
|---|---|
| Address | 6121 MOUNT OLYMPUS DR, CASTRO VALLEY, CA 94552-1960 |
| Document Number | 0000037628 |
|---|---|
| Date | Jan 29, 2021 |
| Instrument | 2021037628 |
| Name | QUICKEN LOANS LLC |
|---|---|
| Type | Mortgage Company |
| Address | DETROIT, MI 48226 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount on Record |
| Term | 241 Months |
| Due | Feb 1, 2041 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Property Address | 6121 MOUNT OLYMPUS DR, CASTRO VALLEY, CA 94552-1960 |
| Document Number | 0000188075 |
| Instrument Date | Aug 15, 2017 |
| Transaction Type | Mortgage |
| Record Updated | Sep 29, 2017 |
| Title Company | FIRST AMERICAN TITLE, FIRST AMERICAN TITLE OFS |
| Name | Verified Name |
|---|---|
| Relationship | Joint Tenants with Right of Survivorship |
| Address | 6121 MOUNT OLYMPUS DR CASTRO VALLEY CA 945521960, CASTRO VALLEY, CA 94552-1960 |
| Document Number | 0000188075 |
|---|---|
| Date | Aug 28, 2017 |
| Instrument | 188075 |
| Name | FREMONT BK |
|---|---|
| Type | Bank |
| Address | LIVERMORE, CA 94551 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Term | 360 Months |
| Due | Aug 27, 2047 |
| Rate Type | Adjustable Rate |
|---|
The 2025 property tax bill for 6121 Mount Olympus Dr was $12,010 with a homeowner's exemption.
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $963,143 (+1.26%) Land $291,043 Building $679,100 | ||
| 2025 | $12,010.00 Homeowner's exemption | $951,123 Land $285,337 Building $665,786 | |
| 2023 | $11,564.00 Homeowner's exemption | $914,194 Land $274,258 Building $639,936 | $1,294,380 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 6121 Mount Olympus Dr in Zone X, an area of minimal flood risk.
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 risk around 6121 Mount Olympus Dr is moderate, ranking above 63% of the US, with a 0.2% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 63% of the US · lower than 61% of California |
|---|---|
| Wildfire Likelihood | 0.2% annual chance |
| Exposure | Indirect within ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
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 |
| 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.
Source: FCC Broadband Data Collection, based on 495 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 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
| AT&T DSL | 100 / 20 |
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