St. Louis City property record for 4100 Union Blvd, Saint Louis, MO 63115
| Property Type | Medical Building |
|---|---|
| Details | 16,500 sqft · built 1951 |
| Lot Size | 1.03 acres (44,998 sqft) |
| Owner | Company Name on File |
| Last Sale | $737,500 (May 2018) |
| Tax Bill | $9,713 (2025) |
| Deeds & Mortgages | May 2018 Line of Credit |
| APN | 4372-9-020.000 |
| Primary APN | 4372-9-020.000 |
|---|---|
| Alternative APN |
|
| Units | 2 Units |
|---|---|
| Stories | 1 Story |
| Building Area | 16,500 sqft Total Area |
| Year Built | Built 1951 |
|---|---|
| Effective Year Built | Effective 1951 |
| Exterior Material | Combination |
| Construction Type | Steel Frame |
| Roof Type | Flat |
| Lot Area | 44,998 sqft |
| Heating System | Central |
|---|
| Street Address | 4100 UNION BLVD |
|---|---|
| City | SAINT LOUIS |
| State | MO |
| Zip | 63115-1225 |
| Property Category | Commercial |
| Property Type | Commercial > Office > Medical Building |
| Local Zoning Code | K |
| Legal Description | C.B. 4372 UNION BLVD 150 FT X 302 FT 5 1/2 IN 1.033 ACRES MARIAS CASTOR ADDN BD-S-297 FT 6 IN N OF MARGARETTA |
| Legal Subdivision | MARIAS CASTOR ADDN |
| Legal Block | 5 |
| Jurisdiction | ST LOUIS CITY MO |
| Township / Civil Division | ST. LOUIS |
| Census Block Group | 5 |
| Census Block | 5005 |
| Census Tract | 126900 |
4100 Union Blvd, a commercial property, is owned by a company that bought it in May 2018.
Source: St. Louis City records, as of June 16, 2026
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Owner of Record | Company Name on File |
|---|---|
| Mailing Address | 1234 LAY RD, SAINT LOUIS, MO 63124-1872 |
| Owner Type | Company |
| Deed Names | Name on Deed |
|---|---|
| Last Sale | May 1, 2018 · Amount on File |
| Deed Sale | May 1, 2018 · Amount on File |
| Prior Sale | Jan 28, 2010 · Amount on File |
| Deed Document Number | 2018145 |
| Prior Transfer Date | Mar 27, 2018 |
| Prior Transfer Doc | 0000000145 |
| Record Updated | Oct 29, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | ST LOUIS CITY MO |
| Recording Date | May 1, 2018 |
| Property Address | 4100 UNION BLVD, SAINT LOUIS, MO 63115-1225 |
| Document Number | 0005010145 |
| Instrument Date | Mar 27, 2018 |
| Instrument | 180501000145 |
| Transaction Type | Transfer |
| Record Updated | May 9, 2018 |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 1234 LAY RD ST LOUIS MO 631241872, ST LOUIS, MO 63124-1872 |
| Document Number | 5010146 |
|---|---|
| Date | May 1, 2018 |
| Instrument | 180501000146 |
| Name | US BK |
|---|---|
| Type | Bank |
| Address | OSHKOSH, WI 54901 |
| Type | Line of Credit |
|---|---|
| Amount | Amount on Record |
| Rate Type | Adjustable Rate |
|---|
The 2025 property tax bill for 4100 Union Blvd was $9,713, down 2.6% from the year before.
Source: St. Louis City assessment roll, as of June 16, 2026
| Type | Name |
|---|---|
| State | Missouri |
| Municipality | St. Louis City |
| Unified School District | St. Louis City School District (PK - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $99,600 (-) Land $24,600 Building $75,000 | ||
| 2025 | $9,713.00 (-2.58%) | $99,600 Land $24,600 Building $75,000 | $311,400 Land $76,900 Building $234,500 |
| 2024 | $9,970.00 (+4.29%) | ||
| 2023 | $9,560.00 (-3.1%) | $99,600 (-) Land $24,600 Building $75,000 | $311,250 Land $76,875 Building $234,375 |
| 2022 | $9,866.00 | $99,600 Land $24,600 Building $75,000 | |
| 2021 | $99,600 |
Assessed value is set for property tax purposes, not a market price estimate; it is a fraction of this property's market value.
FEMA has no flood map on file for 4100 Union Blvd.
Source: FEMA National Flood Hazard Layer
| FEMA Flood Zone | Not on file |
|---|
Values are read at the parcel center point; lenders make the official flood determination.
The area around 4100 Union Blvd 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 | ST LOUIS CITY PWS serves 304,709 people · EPA ID MO6010715 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Oct 2022 |
| Lead | 2 ppb (2023–2025) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | 2 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 204 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Spectrum Cable · Fiber in parts of the area | 1,000 / 1,000 |
| AT&T Fixed Wireless · Fiber, DSL in parts of the area | 100 / 20 |
May also be available: T-Mobile, Verizon.
Search by:
By searching, you agree to: Terms • Privacy • Disclosures