Alameda County property record for 4 Union Sq, Union City, CA 94587
| Property Type | Commercial Office |
|---|---|
| Details | 8,156 sqft · built 1979 |
| Lot Size | 0.88 acres (38,333 sqft) |
| Owner | Company Name on File |
| Last Sale | $1,250,000 (Oct 2002) |
| Tax Bill | $24,652 (2025) |
| Deeds & Mortgages | Feb 2021 Sale Feb 2021 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 87-19-15 |
| Primary APN | 87-19-15 |
|---|---|
| Alternative APN |
|
| Stories | 1 Story |
|---|---|
| Building Area | 8,156 sqft Total Area |
| Year Built | Built 1979 |
|---|---|
| Effective Year Built | Effective 1979 |
| Architectural Style | L-Shape |
| Exterior Material | Concrete Block |
| Construction Type | Masonry / Concrete Block |
| Fire Resistance | Masonry Walls, Wood Interior |
| Roof Material | Wood Shingle |
| Lot Area | 38,333 sqft (0.88 acres) |
| Heating System | HVAC |
|---|
| Street Address | 4 UNION SQ |
|---|---|
| City | UNION CITY |
| State | CA |
| Zip | 94587-3523 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Commercial Office |
| Legal Description | LOT: 00001 BLK: PM: 0098 PAGE: 0072 ;LOT: 00003 BLK: PM: 0098 PAGE: 0072 ;LOT: 0000A BLK: PM: 0340 PAGE: 0070 |
| Legal Subdivision | PARCEL MAP 2094 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | FREMONT |
| Census Block Group | 3 |
| Census Block | 3000 |
| Census Tract | 440338 |
4 Union Sq, a commercial property, is owned by a company that acquired it in February 2021.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 633 E 14TH ST, 100, SAN LEANDRO, CA 94577-2819 |
| Owner Type | Company |
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 |
|---|---|
| Feb 8, 2021 | Grant Deed, Transfer |
| Feb 8, 2021 | Intrafamily Transfer, Transfer |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Oct 2, 2002 · Amount on File |
| Deed Sale | Oct 2, 2002 · Amount on File |
| Deed Document Number | 2002443733 |
| Last Transfer Date | Feb 4, 2021 |
| Transfer Doc | 0000055864 |
| Record Updated | Oct 29, 2026 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Feb 8, 2021 |
| Property Address | 4 UNION SQ, UNION CITY, CA 94587-3523 |
| Document Number | 0000055865 |
| Map Reference | MB 98 PG 72&73 |
| Instrument Date | Feb 5, 2021 |
| Instrument | 2021055865 |
| Transaction Type | Transfer |
| Record Updated | Aug 19, 2021 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 29909 BELLO VIEW PL, 29909, HAYWARD, CA 94544-6807 |
| Name | Verified Name |
|---|---|
| Address | 4 UNION SQ, UNION CITY, CA 94587-3523 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Feb 8, 2021 |
| Property Address | 4 UNION SQ, UNION CITY, CA 94587-3523 |
| Document Number | 0000055864 |
| Map Reference | MB 98 PG 72&73 |
| Instrument Date | Feb 4, 2021 |
| Instrument | 2021055864 |
| Transaction Type | Transfer |
| Record Updated | Jun 7, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|---|
| Address | 29909 BELLO VIEW PL, 29909, HAYWARD, CA 94544-6807 |
| Name | Verified Name |
|---|---|
| Relationship | Irrevocable Trust |
| Address | 4 UNION SQ, UNION CITY, CA 94587-3523 |
The 2025 property tax bill for 4 Union Sq was $24,652, up 4.6% from the year before.
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Municipality | Union City |
| Unified School District | New Haven Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $1,846,449 (+2%) Land $1,130,027 Building $716,422 | |
| 2025 | $24,652.00 (+4.56%) | $1,810,250 Land $1,107,873 Building $702,377 |
| 2024 | $23,577.00 (-0.88%) | |
| 2023 | $23,786.00 | $1,739,974 Land $1,064,864 Building $675,110 |
Assessed value is set for property tax purposes and is not a market price estimate.
FEMA maps place 4 Union Sq in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective May 25, 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 |
| Nearby Flood Policies | 5 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.
Wildfire risk around 4 Union Sq is low, with a 0.01% annual chance of wildfire.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.01% 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: EPA Safe Drinking Water Information System, as of September 2026
| Water System | ALAMEDA COUNTY WATER DISTRICT serves 344,000 people · EPA ID CA0110001 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Nov 2025 |
| 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.
Source: FCC Broadband Data Collection, based on 220 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| Tekify Fiber & Wireless Fixed Wireless | 10,000 / 10,000 |
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Xfinity Cable · Fiber in parts of the area | 2,000 / 250 |
| RobinsonHSS Fixed Wireless | 1,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: GeoLinks, Sail Internet, T-Mobile.
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