Alameda County property record for 20642 John Dr, Castro Valley, CA 94546
| Property Type | Medical Building |
|---|---|
| Details | 25,000 sqft · built 2020 |
| Lot Size | 1.24 acres (54,158 sqft) |
| Owner | 2 Company Names on Record |
| Last Sale | $16,600,000 (Mar 2021) |
| Tax Bill | $317,203 (2025) |
| Deeds & Mortgages | Dec 2025 Sale Mar 2021 Sale + 2 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 84A-228-2-8 |
| Primary APN | 84A-228-2-8 |
|---|---|
| Alternative APN |
|
| Full Baths | 6.5 Baths |
|---|---|
| Half Baths | 1 Half Bath |
| Stories | 2 Stories |
| Building Area | 25,000 sqft Total Area |
| Elevator | Elevator |
| Year Built | Built 2020 |
|---|---|
| Effective Year Built | Effective 2020 |
| Construction Type | Masonry / Concrete Block |
| Fire Resistance | Masonry Walls, Wood Interior |
| Lot Area | 54,158 sqft |
| Parking Spaces | 98 Parking Spaces |
| Street Address | 20642 JOHN DR |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-5103 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Medical Building |
| Legal Description | LOT: 00007 BLK: 0002 AR: 084A PAGE: 0228 ;LOT: 00008 BLK: 0004 AR: 084A PAGE: 0224 |
| Legal Subdivision | STANTON 01 |
| Legal Lot Number | 4 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 2 |
| Census Block | 2002 |
| Census Tract | 430600 |
Source: Alameda County records, as of August 5, 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 | 7999 GATEWAY BLVD, 200, NEWARK, CA 94560-1197 |
| Owner Type | Company |
| Vesting | Company |
| Date | Document |
|---|---|
| Dec 31, 2025 | Grant Deed, Transfer |
| Mar 25, 2021 | Grant Deed, Transfer FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY |
| Jul 2, 2019 | Grant Deed, Construction Loan · Construction Mortgage BBVA USA |
| Jul 3, 2019 | Grant Deed, Transfer FIRST AMERICAN TITLE, FIRST AMERICAN TITLE INS CO NA |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Mar 25, 2021 · Amount on Record |
| Deed Sale | Mar 25, 2021 · Amount on Record |
| Prior Sale | Jul 2, 2019 · Amount on Record |
| Deed Document Number | 2021120891 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Dec 31, 2025 |
| Property Address | 20642 JOHN DR, CASTRO VALLEY, CA 94546-5103 |
| Document Number | 0000167314 |
| Instrument Date | Oct 1, 2025 |
| Instrument | 2025167314 |
| Transaction Type | Transfer |
| Record Updated | Feb 5, 2026 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 7999 GATEWAY BLVD STE 200, 200, NEWARK, CA 94560-1197 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Mar 25, 2021 |
| Property Address | 20642 JOHN DR, CASTRO VALLEY, CA 94546-5103 |
| Document Number | 0000120891 |
| Instrument Date | Mar 17, 2021 |
| Instrument | 2021120891 |
| Transaction Type | Transfer |
| Record Updated | Aug 19, 2021 |
| Title Company | FIRSTAMERICAN TITLE COMPANY, FIRST AMERICAN TITLE COMPANY |
| Amount | Amount Recorded |
|---|---|
| Tax | $18,260.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 300 PASTEUR DR # 5451, 5451, PALO ALTO, CA 94304-2203 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Jul 2, 2019 |
| Property Address | 20642 JOHN DR, CASTRO VALLEY, CA 94546-5103 |
| Document Number | 0000125969 |
| Map Reference | MB 17 PG 6 |
| Instrument Date | Jun 21, 2019 |
| Instrument | 2019125969 |
| Transaction Type | Construction Loan |
| Record Updated | Jul 19, 2022 |
| Title Company | FIRST AMER TTL INS CO NATL C |
| Amount | Amount Recorded |
|---|---|
| Tax | $0.00 |
| Amount Accuracy | Rounded by County |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 2420 CAMINO RAMON STE 215, 215, SAN RAMON, CA 94583-4207 |
| Document Number | 0000125970 |
|---|---|
| Date | Jul 2, 2019 |
| Instrument | 2019125970 |
| Name | BBVA USA |
|---|---|
| Type | Non-Lending Institution |
| Type | Construction Mortgage |
|---|---|
| Amount | Amount Recorded |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Jul 3, 2019 |
| Property Address | 20642 JOHN DR, CASTRO VALLEY, CA 94546-5103 |
| Document Number | 0000127015 |
| Instrument Date | Jun 14, 2019 |
| Instrument | 127015 |
| Transaction Type | Transfer |
| Record Updated | Jul 29, 2019 |
| Title Company | FIRST AMERICAN TITLE, FIRST AMERICAN TITLE INS CO NA |
| Amount | Amount Recorded |
|---|---|
| Tax | $3,987.50 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 300 PASTEUR DR MC 5451 STANFORD CA 94304, STANFORD, CA 94304 |
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 |
|---|---|---|
| 2026 | $26,607,846 (+2%) Land $5,078,676 Building $21,529,170 | |
| 2025 | $317,203.00 (+1.71%) | $26,086,322 (+2.04%) Land $4,979,132 Building $21,107,190 |
| 2023 | $311,880.00 | $25,565,674 Land $4,785,840 Building $20,779,834 |
Assessed value is set for property tax purposes and is not a market price estimate.
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Not rated no burnable land 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 459 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Unwired Fixed Wireless | 300 / 25 |
| Etheric Networks Fixed Wireless | 250 / 100 |
May also be available: GeoLinks, T-Mobile, Verizon.
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