Commercial Real Estate Market in Seneca, IL
Updated monthly: sale, lease, property records, location trend, and more… · Last update: August 31
80 active listings and 163 off-market properties in Seneca, IL.
Market Trends
Seneca, IL spans 47.4 square miles in LaSalle County, Illinois. Figures below refresh monthly; last updated 31 August 2026.
Office
Office vacancy in Seneca, 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 Seneca, IL runs 6.3% across the Midwest region in 2025, down from 8% in 2020.
Vacancy Rate % in Midwest region
Industrial
Industrial vacancy in Seneca, 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 vacancy in Seneca, IL runs 8% across the Midwest region in 2025, up from 6.5% in 2022.
Vacancy Rate % in Midwest region
Zoning & Land Use
Land Use Mix share of zoned land by category
- Industrial 56.7%
- Residential 22%
- Agricultural 4.7%
- Commercial 1.8%
Largest Zones share of zoned land by district
Industrial District
Traditional Residential 5000 To 70000 Square Feet Lot
Riverfront District
Agricultural Areas And Conservation Open Space District
No Zoning
Seneca, IL zones 4,126 acres across 11 districts. Commercial zoning covers 1.8% of zoned land, residential 22% and industrial 56.7%. The largest single district is Industrial District at 56.7%. For commercial buyers the practical constraint is that only 58.5% of land carries a commercial or industrial designation.
Industrial District (I)
The intent of this zone to promote industrial uses
Market overview
Demographics & Economy
Seneca, IL has 3,306 residents in 1,319 households. Density runs 70 people per square mile. Median household income here is $94,137 and median gross rent $1,057 a month.
3,306
Population
1,319
Households
2.5
Avg Household Size
39
Median Age
16%
College-Educated
96%
High-School Grad
47.4 sq mi
ZIP Area
70
Density / Sq Mi
$94,137
Median Household Income
$41,479
Median Earnings
$1,057
Median Rent
$240,800
Median Home Value
Tools
Nearby Markets
| Market | Average Sale Price, $/SF | Average Lease Price, $/SF/Yr |
|---|---|---|
| Marseilles | — | — |
| Verona | — | — |
| Kinsman | — | — |
| Morris | — | $9.75 |
Frequently Asked Questions
What zoning applies to commercial property in Seneca?
Seneca, IL zones 4,126 acres across 11 districts, of which 1.8% is commercial and 56.7% industrial. The largest single district is Industrial District at 56.7% of zoned land. The intent of this zone to promote industrial uses Residential zoning covers 22% and open space 0%.
Where does Realmo's Seneca market data come from?
Realmo compiles Seneca, IL figures from 4 recent recorded sales, 80 active sale listings, 163 tracked off-market properties, the current Seneca zoning release. Sale and lease figures refresh monthly; vacancy annually. Last updated 31 August 2026.
Methodology & data sources
- Asking prices and averages
- Computed from 80 active for-sale and 0 active for-lease listings in Seneca, 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.
- Zoning and land use
- The current municipal zoning release: 4,126 zoned acres across 11 districts. Shares are of zoned land, so parcels the release leaves unclassified are excluded from the mix.
- Refresh
- The monthly aggregates close at the end of the previous month, so 31 August 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 and industrial vacancy is reported at Midwest region level.
- 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 31 August 2026 · report a data issue
