Dane County property record for 821 Williamson St, Madison, WI 53703
| Property Type | Commercial |
|---|---|
| Details | 27 ba · 19,433 sqft · built 2022 |
| Lot Size | 0.298 acres (12,959 sqft) |
| Owner | Company Name on File |
| Tax Bill | $79,002 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 0709-134-1433-3 |
| Primary APN | 0709-134-1433-3 |
|---|
| Full Baths | 27 Baths |
|---|---|
| Units | 38 Units |
| Stories | 3 Stories |
| Building Area | 19,433 sqft Gross Area |
| 1st Floor Area | 6,753 sqft |
| Flooring | Wood |
| Year Built | Built 2022 |
|---|---|
| Effective Year Built | Effective 2022 |
| Exterior Material | Brick |
| Roof Type | Flat |
| Roof Material | Other |
| Lot Area | 12,959 sqft (0.298 acres) |
| Lot Dimensions | 132 ft deep x 97.5 ft wide |
| View / Lot | Traffic |
| Cooling System | Central |
|---|
| Street Address | 821 WILLIAMSON ST |
|---|---|
| City | MADISON |
| State | WI |
| Zip | 53703-4041 |
| Property Category | Commercial |
| Property Type | Commercial > Retail |
| Local Zoning Code | HIS-TL |
| Legal Description | CERTIFIED SURVEY MAP 15718 AS RECORDED IN DANE COUNTY REGISTER OF DEEDS IN VOL 1 14 PAGE 159 OF CERTIFIED SURVEYS, LOT 1. |
| Legal Range | 09E |
| Legal Township | 07N |
| Legal Section | 13 |
| Legal Quarter | 4 |
| Legal Subdivision | CERTIFIED SURVEY MAP 15718 AS RECORDED |
| Legal Lot Number | 1 |
| Jurisdiction | DANE WI |
| Township / Civil Division | MADISON |
| Census Block Group | 1 |
| Census Block | 1004 |
| Census Tract | 1901 |
821 Williamson St, a commercial property, is owned by a company.
Source: Dane County records, as of April 21, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | PO BOX 694, MADISON, WI 53701-0694 |
| Owner Type | Company |
| Vesting | Limited Liability Company |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Deed Names | Name on Deed |
|---|---|
| Record Updated | Jun 8, 2026 |
The 2025 property tax bill for 821 Williamson St was $79,002, up 16.7% from the year before.
Source: Dane County assessment roll, as of March 16, 2026
| Type | Name |
|---|---|
| State | Wisconsin |
| County | Dane County |
| Municipality | Madison City |
| Unified School District | Madison Metropolitan School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2025 | $79,002.00 (+16.66%) | $4,213,000 (+1%) Land $350,000 Building $3,863,000 | |
| 2024 | $67,718.00 | $3,830,000 (+42.91%) Land $350,000 Building $3,480,000 | $3,830,000 (+42.11%) |
| 2023 | $2,680,000 Land $350,000 Building $2,330,000 | $2,695,093 | |
| 2022 | $15,371.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 821 Williamson St in Zone X, an area of minimal flood risk, within 500 ft of a high-risk flood zone.
Source: FEMA National Flood Hazard Layer, effective September 20, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Nearby Flood Policies | 6 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.
The area around 821 Williamson St has no burnable land within ember reach, so its wildfire risk is not rated.
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 | MADISON WATER UTILITY serves 272,000 people · EPA ID WI1130224 |
|---|---|
| Water Source | Groundwater |
| Last State Inspection | Apr 2023 |
| Lead | 2 ppb (2023) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | Lead service line inventory Oct 2024 |
| Monitoring and Reporting | 1 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 427 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · Fixed Wireless, DSL in parts of the area | 5,000 / 5,000 |
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
| Verizon Fixed Wireless | 1,000 / 75 |
| LiteWire Fixed Wireless · Fiber in parts of the area | 100 / 25 |
| T-Mobile Fixed Wireless | 100 / 20 |
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