Minnehaha County property record for 121 S Williams Ave, Sioux Falls, SD 57104
| Property Type | Office Building |
|---|---|
| Details | 3 ba · 4,136 sqft · built 1999 |
| Lot Size | 0.44 acres (19,171 sqft) |
| Owner | Company Name on File |
| Last Sale | $553,500 (May 2022) |
| Tax Bill | $6,825 (2025) |
| Flood Zone | Zone X (reduced by levee) |
| APN | 01-22-18-451-011-000 |
| Primary APN | 01-22-18-451-011-000 |
|---|---|
| Alternative APN |
|
| Full Baths | 3 Baths |
|---|---|
| Plumbing Fixtures | 9 Plumbing Fixtures |
| Stories | 1 Story |
| Building Area | 4,136 sqft Heated Area |
| 1st Floor Area | 4,136 sqft |
| Flooring | Carpet |
| Year Built | Built 1999 |
|---|---|
| Effective Year Built | Effective 1999 |
| Exterior Material | Combination |
| Construction Type | Frame |
| Foundation Type | Concrete |
| Roof Type | Gable |
| Roof Material | Asphalt |
| Lot Area | 19,171 sqft (0.44 acres) |
| Parking Spaces | 3 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | HVAC |
| Heating Fuel | Gas |
| Account Number | 69539 |
|---|---|
| Street Address | 121 S WILLIAMS AVE |
| City | SIOUX FALLS |
| State | SD |
| Zip | 57104-3135 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Office Building |
| Local Zoning Code | FP;FP |
| Legal Description | TRACT A LOTS 3 & 4 4 BLOCK 8 BRALEY`S 1ST ADDN TO CITY OF SIOUX FALLS |
| Legal Subdivision | BRALEY`S 1ST ADDN |
| Legal Tract | A |
| Legal Block | 8 |
| Legal Lot Number | 3-4 |
| Jurisdiction | MINNEHAHA SD |
| Township / Civil Division | SIOUX FALLS |
| Census Block Group | 3 |
| Census Block | 3000 |
| Census Tract | 900 |
121 S Williams Ave, a commercial property, is owned by a company that bought it in May 2022.
Source: Minnehaha County records, as of September 23, 2026
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 1520 S RIVERDALE RD, SIOUX FALLS, SD 57105-1243 |
| Owner Type | Company |
| Vesting | 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 |
|---|---|
| Last Sale | May 9, 2022 · Amount on File |
| Deed Sale | May 9, 2022 · Amount on File |
| Deed Book / Page | 613-D / 347 |
| Record Updated | Oct 29, 2026 |
The 2025 property tax bill for 121 S Williams Ave was $6,825.
Source: Minnehaha County assessment roll, as of July 16, 2026
| Type | Name |
|---|---|
| State | South Dakota |
| County | Minnehaha County |
| Municipality | Sioux Falls City |
| Unified School District | Sioux Falls School District 49-5 (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $439,500 (+8.68%) Land $92,300 Building $347,200 | $439,500 Land $92,300 Building $347,200 | |
| 2025 | $6,825.00 | $404,400 (-1.22%) Land $76,900 Building $327,500 | |
| 2024 | $6,825.00 | $409,400 Land $76,900 Building $332,500 | |
| 2022 | $7,687.00 | $408,000 Land $91,100 Building $316,900 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 121 S Williams Ave in Zone X, where a levee reduces flood risk, though there have been 29 flood claims nearby since 2004.
Source: FEMA National Flood Hazard Layer, effective May 2, 2024 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X reduced by levee · depends on levee performance |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 7 in force |
| Nearby Flood Claims | 29 (2004–2017) |
| Claims Outside the SFHA | 22 of 29 |
| Most Recent Claim | Apr 2017 |
| Claims by Event |
|
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 121 S Williams Ave is low, with less than 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 99.8% of the US · lower than 99.5% of South Dakota |
|---|---|
| Wildfire Likelihood | Under 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 | SIOUX FALLS serves 216,462 people · EPA ID SD4600294 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Jun 2025 |
| Lead | 3 ppb (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 168 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Bluepeak Fiber | 5,000 / 5,000 |
| Midco Cable | 2,000 / 1,000 |
| Verizon Fixed Wireless | 300 / 20 |
| Starlink Satellite | 280 / 30 |
May also be available: CenturyLink, T-Mobile.
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