Dane County property record for 803 Williamson St, Madison, WI 53703
| Property Type | Mixed Use Commercial Office / Residential |
|---|---|
| Details | 836 sqft · built 1884 |
| Lot Size | 0.05 acres (2,178 sqft) |
| Owner | Company Name on Record |
| Last Sale | $60,000 (Oct 2015) |
| Tax Bill | $14,574 (2024) |
| Flood Zone | Zone X (minimal risk) |
| APN | 0709-134-1415-1 |
| Primary APN | 0709-134-1415-1 |
|---|
| Stories | 2 Stories |
|---|---|
| Building Area | 836 sqft Total Area |
| 1st Floor Area | 1,408 sqft |
| 2nd Floor Area | 1,458 sqft |
| Flooring | Carpet |
| Interior Walls | Wallboard/Drywall |
| Year Built | Built 1884 |
|---|---|
| Effective Year Built | Effective 1900 |
| Exterior Material | Brick |
| Foundation Type | Concrete |
| Roof Material | Asphalt |
| Lot Area | 2,178 sqft (0.05 acres) |
| Total Buildings | 2 Buildings |
| Sewer | Municipal |
|---|---|
| Water Source | Commercial |
| Street Address | 803 WILLIAMSON ST |
|---|---|
| City | MADISON |
| State | WI |
| Zip | 53703-3547 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Mixed Use Commercial Office / Residential |
| Local Zoning Code | HIS-TL, TSS |
| Legal Description | ORIGINAL PLAT, BLK 148, NW 1/2 OF SW 1/2 OF LOT 1 |
| Legal Range | 09 |
| Legal Township | 07 |
| Legal Section | 13 |
| Legal Subdivision | MADISON |
| Legal Block | 148 |
| Legal Lot Number | 1 |
| Jurisdiction | DANE WI |
| Township / Civil Division | MADISON |
| Census Block Group | 1 |
| Census Block | 1004 |
| Census Tract | 1901 |
Source: Dane County records, as of January 22, 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Company Name on Record |
|---|---|
| Mailing Address | PO BOX 694, MADISON, WI 53701-0694 |
| Owner Type | Company |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | Oct 19, 2015 · Amount on Record |
| Deed Sale | Oct 19, 2015 · Amount on Record |
| Deed Document Number | 5191491 |
| Record Updated | Jun 8, 2026 |
Source: Dane County assessment roll, as of January 1, 2024
| 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 |
|---|---|---|---|
| 2024 | $14,574.00 (+8.36%) | $828,000 (+9.96%) Land $60,000 Building $768,000 | $828,000 |
| 2023 | $753,000 Land $60,000 Building $693,000 | ||
| 2022 | $13,449.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
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.
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 |
Search by:
By searching, you agree to: Terms • Privacy • Disclosures