Commercial Real Estate Market in Mountainside, NJ
Updated monthly: sale, lease, property records, location trend, and more… · Last update: August 31
14 active listings and 165 off-market properties in Mountainside, NJ. Commercial property asks $425/SF to buy and $17.03/SF/Yr to lease.
Market Trends
Mountainside, NJ spans 4.0 square miles in Union County, New Jersey. Figures below refresh monthly; last updated 31 August 2026.
Office
Office space in Mountainside, NJ asks $283/SF to buy. Vacancy runs 19.9% across the Northeast region in 2025, up from 13.1% in 2019.
Average Sale Price $/SF
Listings
Vacancy Rate % in Northeast region
Retail
Retail space in Mountainside, NJ asks $403/SF to buy. Vacancy runs 6% across the Northeast region in 2025, little changed from 6% in 2019. Down from a 2020 peak of 7.1%.
Average Sale Price $/SF
Listings
Vacancy Rate % in Northeast region
Industrial
Industrial vacancy in Mountainside, NJ runs 7.6% across the Northeast region in 2025, up from 5.4% in 2019. Nearly 2.4x the 2021 low of 3.2%.
Vacancy Rate % in Northeast region
Multifamily
Multifamily space in Mountainside, NJ asks $288/SF to buy. Vacancy runs 5.6% across the Northeast region in 2025, up from 4% in 2022.
Average Sale Price $/SF
Listings
Vacancy Rate % in Northeast region
Zoning & Land Use
Land Use Mix share of zoned land by category
- Residential 89.6%
- Industrial 8.2%
- Commercial 2%
- Civic 0.3%
Largest Zones share of zoned land by district
One Family Residence
One Family Residence
Limited Industrial
Limited Industrial And Affordable Housing
Office Building
Mountainside, NJ zones 2,571 acres across 11 districts. Commercial zoning covers 2% of zoned land, residential 89.6% and industrial 8.2%. The largest single district is One Family Residence at 51.7%. For commercial buyers the practical constraint is that only 10.2% of land carries a commercial or industrial designation.
One Family Residence (R-1)
This zoning district is designed for single family residential use.
Market overview
Demographics & Economy
Mountainside, NJ has 7,082 residents in 2,616 households. Density runs 1,773 people per square mile. Median household income here is $210,100 and median gross rent $3,501 a month.
7,082
Population
2,616
Households
2.7
Avg Household Size
47
Median Age
66%
College-Educated
97%
High-School Grad
4 sq mi
ZIP Area
1,773
Density / Sq Mi
$210,100
Median Household Income
$87,207
Median Earnings
$3,501
Median Rent
$755,600
Median Home Value
Tools
Nearby Markets
| Market | Average Sale Price, $/SF | Average Lease Price, $/SF/Yr |
|---|---|---|
| Westfield | — | $29.59 |
| Garwood | — | — |
| Scotch Plains | — | — |
| Fanwood | — | — |
Commercial property in Mountainside, NJ asks $425/SF.
Frequently Asked Questions
What is the average price per square foot for commercial property in Mountainside?
Commercial property in Mountainside, NJ asks an average of $425 per square foot. The 3 most recent recorded sales traded at a median of $356/SF, so asking sits 19% above the achieved median. Retail carries the highest asking price at $403/SF.
How much does it cost to lease commercial space in Mountainside?
Asking lease rates in Mountainside, NJ average $17.03 per square foot per year.
What zoning applies to commercial property in Mountainside?
Mountainside, NJ zones 2,571 acres across 11 districts, of which 2% is commercial and 8.2% industrial. The largest single district is One Family Residence at 51.7% of zoned land. Residential zoning covers 89.6% and open space 0%.
Where does Realmo's Mountainside market data come from?
Realmo compiles Mountainside, NJ figures from 6 recent recorded sales, 9 active sale listings, 5 active lease listings, 165 tracked off-market properties, the current Mountainside zoning release. Sale and lease figures refresh monthly; vacancy annually. Last updated 31 August 2026.
Methodology & data sources
- Asking prices and averages
- Computed from 9 active for-sale and 5 active for-lease listings in Mountainside, NJ. 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: 2,571 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 Northeast region level, retail vacancy is reported at Northeast region level and industrial vacancy is reported at Northeast 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
