Alameda County property records for 15 addresses on Blackstone Ct, Castro Valley, CA · Last verified August 2026
| Properties | 15 |
|---|---|
| Median Sale Price | $1,388,000 |
| Deeds and Mortgages on File | 20 |
| Median Price per Sqft | $477 |
| Owner Occupied | 100% |
| Median Annual Tax Bill | $13,979 |
| Median Year Built | 1998 |
| Median Ownership Tenure | 26 years |
Owner names and prior sale amounts shown locked below are available instantly with a free trial.
5 bd · 3 ba · 3,341 sqft · built 1998 · 1.19 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $434,000Mar 1998 | $10,2562025 | —Sep 2020 | 1 Name on Record Owner Occupied | Assessor + 4 DocumentsUpdated Oct 2025 |
5 bd · 4 ba · 3,682 sqft · built 1998 · 1.22 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $2,000,000Aug 2025 | $18,1932025 | —Feb 2018 | 2 Names on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2025 |
8 bd · 6 ba · 3,988 sqft · built 1998 · 0.964 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,200,000Sep 2015 | $18,1482025 | —Feb 2008 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Oct 2025 |
4 bd · 3 ba · 3,159 sqft · built 1997 · 1.06 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $329,000Mar 1997 | $11,1062025 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
4 bd · 3 ba · 3,522 sqft · built 1998 · 0.947 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $488,500May 1998 | $11,9322025 | —Jul 2007 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
5 bd · 5 ba · 3,887 sqft · built 1998 · 0.93 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $445,500May 1998 | $13,9792025 | —May 2007 | 1 Name on Record Owner Occupied | Assessor + 2 DocumentsUpdated Oct 2025 |
5 bd · 3.5 ba · 3,682 sqft · built 1998 · 0.944 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $503,500Mar 1998 | $11,0622025 | —Mar 2004 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
4 bd · 3 ba · 2,347 sqft · built 1998 · 0.94 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $675,000Aug 2009 | $11,6732025 | Amount on Record May 1998 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Oct 2025 |
5 bd · 3 ba · 3,072 sqft · built 1998 · 0.937 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,510,000Jun 2020 | $20,7542025 | —May 2015 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Oct 2025 |
4 bd · 3 ba · 2,620 sqft · built 1998 · 1.03 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,250,000Sep 2017 | $18,1682025 | —Oct 2005 | 2 Names on Record Owner Occupied | Assessor + 3 DocumentsUpdated Oct 2025 |
4 bd · 3 ba · 3,072 sqft · built 1998 · 1.18 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,388,000Jun 2018 | $19,9152025 | —May 2016 | 2 Names on Record Owner Occupied | Assessor + 1 DocumentUpdated Oct 2025 |
4 bd · 3 ba · 2,475 sqft · built 1998 · 0.959 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $800,000Jul 2000 | $15,5622025 | Amount on Record Dec 1996 | 1 Name on Record Owner Occupied | Assessor + 1 DocumentUpdated Aug 2026 |
5 bd · 3.5 ba · 3,682 sqft · built 1998 · 1.29 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $523,500Mar 1998 | $11,2562025 | —Apr 2003 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
4 bd · 3 ba · 3,072 sqft · built 1998 · 1.16 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $432,500Mar 1998 | $9,5612025 | 1 Name on Record Owner Occupied | AssessorUpdated Aug 2026 |
4 bd · 3.5 ba · 3,144 sqft · built 1997 · 1.24 acres
| Last Sale | Tax Bill | Prior Sale | Owner | Records |
|---|---|---|---|---|
| $1,500,000Mar 2017 | $22,6772025 | Amount on Record Mar 1997 | 1 Name on Record Owner Occupied | Assessor + 3 DocumentsUpdated Aug 2026 |
Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020
| Wildfire Risk | Moderate this street's cells rank above 62% of the US · above 38% of California |
|---|---|
| Wildfire Likelihood | About 1 in 512 per year |
| Exposure | Direct 2 of 3 cells directly exposed · 3 adjoin burnable vegetation |