Commercial Real Estate Market in O Fallon, IL
Updated monthly: sale, lease, property records, location trend, and more… · Last update: September 30
284 active listings and 2,768 off-market properties in O Fallon, IL. Commercial property asks $89/SF to buy and $11.50/SF/Yr to lease.
Market Trends
O Fallon, IL spans 29.8 square miles in St. Clair County, Illinois. Figures below refresh monthly; last updated 30 September 2026.
Office
Office vacancy in O Fallon, IL runs 21.3% across the Midwest region in 2025, up from 13.7% in 2019.
Vacancy Rate % in Midwest region
Retail
Retail vacancy in O Fallon, IL runs 6.3% across the Midwest region in 2025, down from 8% in 2020.
Vacancy Rate % in Midwest region
Industrial
Industrial vacancy in O Fallon, IL runs 4.9% across the Midwest region in 2025, up from 4.4% in 2019. Nearly 1.6x the 2022 low of 3.1%.
Vacancy Rate % in Midwest region
Multifamily
Multifamily space in O Fallon, IL asks $81/SF to buy. Vacancy runs 8% across the Midwest region in 2025, up from 6.5% in 2022.
Average Sale Price $/SF
Listings
Vacancy Rate % in Midwest region
Market overview
Demographics & Economy
O Fallon, IL has 36,068 residents in 14,616 households. Density runs 1,209 people per square mile. Median household income here is $100,167 and median gross rent $1,258 a month.
36,068
Population
14,616
Households
2.5
Avg Household Size
38
Median Age
51%
College-Educated
97%
High-School Grad
29.8 sq mi
ZIP Area
1,209
Density / Sq Mi
$100,167
Median Household Income
$58,724
Median Earnings
$1,258
Median Rent
$274,200
Median Home Value
Tools
Nearby Markets
| Market | Average Sale Price, $/SF | Average Lease Price, $/SF/Yr |
|---|---|---|
| Fairview Heights | — | — |
| Swansea | — | — |
| Collinsville | — | — |
Commercial property in O Fallon, IL asks $89/SF.
Frequently Asked Questions
What is the average price per square foot for commercial property in O Fallon?
Commercial property in O Fallon, IL asks an average of $89 per square foot. The 5 most recent recorded sales traded at a median of $25/SF, so asking sits 255% above the achieved median. Multifamily carries the highest asking price at $81/SF.
How much does it cost to lease commercial space in O Fallon?
Asking lease rates in O Fallon, IL average $11.50 per square foot per year.
Where does Realmo's O Fallon market data come from?
Realmo compiles O Fallon, IL figures from 5 recent recorded sales, 233 active sale listings, 51 active lease listings, 2,768 tracked off-market properties. Sale and lease figures refresh monthly; vacancy annually. Last updated 30 September 2026.
Methodology & data sources
- Asking prices and averages
- Computed from 233 active for-sale and 51 active for-lease listings in O Fallon, IL. These are ASKING figures from live listings, not closed-transaction prices, and a segment carried by a handful of listings reads as indicative rather than an average.
- Vacancy rates
- Published per-sector market series, taken at the metro level where one exists and otherwise at the Census-region level — a chart reading "in <region> region" is a regional number, not this city's.
- Refresh
- The monthly aggregates close at the end of the previous month, so 30 September 2026 — not today — is the honest last update.
- Known limitations
- office vacancy is reported at Midwest region level, retail vacancy is reported at Midwest region level, industrial vacancy is reported at Midwest region level and asking prices run materially above recent closed pricing.
- Coverage
- Metrics below the 10-observation threshold fall back one geographic level. The geography used is named on each figure.
Compiled by the Realmo Data team · reviewed 30 September 2026 · report a data issue
